<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row >
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row  :class="['bdbottom',i1===0?'bdtop':'','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <el-row :class="[i2===0?'':'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                  <!-- 通过 for 循环 嵌套渲染二级权限 -->
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable  @close="removeRightById(scope.row, item3.id)">
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>

              </el-col>
            </el-row>
            <!-- <pre>{{scope.row}}</pre> -->

          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
  export default{
    data(){
      return{
        rolelist: [],
        // 所有权限的数据
        rightslist: [],
        // 树形控件的属性绑定对象
        treeProps: {
          label: 'authName',
          children: 'children'
        },
        // 默认选中的节点Id值数组
        defKeys: [],
        // 当前即将分配权限的角色id
        roleId: '',
        // 控制分配权限对话框的显示与隐藏
        setRightDialogVisible: false,
      }
    },
    created() {
      this.getRolesList()
    },
    methods:{
        // 获取所有角色的列表
        async getRolesList() {
          const { data: res } = await this.$http.get('roles')

          if (res.meta.status !== 200) {
            return this.$message.error('获取角色列表失败！')
          }

          this.rolelist = res.data

          console.log(this.rolelist)
        },
       // 根据Id删除对应的权限
       async removeRightById(role, rightId) {
         // 弹框提示用户是否要删除
         const confirmResult = await this.$confirm(
           '此操作将永久删除该文件, 是否继续?',
           '提示',
           {
             confirmButtonText: '确定',
             cancelButtonText: '取消',
             type: 'warning'
           }
         ).catch(err => err)

         if (confirmResult !== 'confirm') {
           return this.$message.info('取消了删除！')
         }

         const { data: res } = await this.$http.delete(
           `roles/${role.id}/rights/${rightId}`
         )

         if (res.meta.status !== 200) {
           return this.$message.error('删除权限失败！')
         }

         // this.getRolesList()
         role.children = res.data
       },
       // 展示分配权限的对话框
       async showSetRightDialog(role) {
          this.roleId = role.id
         // 获取所有权限的数据
         const { data: res } = await this.$http.get('rights/tree')
          if (res.meta.status !== 200) {
            return this.$message.error('获取权限数据失败！')
          }
          // 把获取到的权限数据保存到 data 中
          this.rightslist = res.data
          console.log(this.rightslist)

          // 递归获取三级节点的Id
          this.getLeafKeys(role, this.defKeys)

         this.setRightDialogVisible = true
       },
       // 通过递归的形式，获取角色下所有三级权限的id，并保存到 defKeys 数组中
       getLeafKeys(node, arr) {
         // 如果当前 node 节点不包含 children 属性，则是三级节点
         if (!node.children) {
           return arr.push(node.id)
         }

         node.children.forEach(item => this.getLeafKeys(item, arr))
       },
       // 监听分配权限对话框的关闭事件
       setRightDialogClosed() {
         this.defKeys = []
       },
       // 点击为角色分配权限
       async allotRights() {
         const keys = [
           ...this.$refs.treeRef.getCheckedKeys(),
           ...this.$refs.treeRef.getHalfCheckedKeys()
         ]

         const idStr = keys.join(',')

         const { data: res } = await this.$http.post(
           `roles/${this.roleId}/rights`,
           { rids: idStr }
         )

         if (res.meta.status !== 200) {
           return this.$message.error('分配权限失败！')
         }

         this.$message.success('分配权限成功！')
         this.getRolesList()
         this.setRightDialogVisible = false
       }
    },
  }
</script>

<style lang="less" scoped>
  .el-breadcrumb{
    margin-bottom: 15px;
  }
  .el-button {
    margin-bottom: 15px;
  }
  .el-tag {
    margin: 7px;
  }
  .bdtop{
    border-top: 1px solid #eee;
  }
  .bdbottom{
    border-bottom: 1px solid #eee;
  }
  .vcenter{
    display: flex;
    align-items: center;
  }
</style>
